{"product_id":"edelbrock-54903u-904-®-rhs®-high-performance-standard-deck-ls-engine-block","title":"Edelbrock 54903U-904 - RHS LS Aluminum Race Block 9.240in Standard Deck 4.120in Bore 0.904in Lifter","description":"\u003cp\u003eEdelbrock 54903U-904 - RHS LS Aluminum Race Block 9.240in Standard Deck 4.120in Bore 0.904in Lifter\u003c\/p\u003e\u003cp\u003eEdelbrock® RHS® High-Performance Standard-Deck LS Engine Block\u003c\/p\u003e\u003cp\u003eRHS® LS aluminum blocks, available in standard or tall deck, feature 55 mm cam bores, 0.904\" lifter bores, raised cam and outboard oiling for 4.600\" stroke clearance. CT-scanned for precision, the base for high-horsepower builds.\u003c\/p\u003e\u003cp\u003eBlock Specifications: Designed from heavy-duty A357-T6 aluminum material, 4.125”-4.165” siamese cast bore walls w\/ press-in spun cast iron liner, Available in standard (9.240”) \u0026amp; tall (9.750”) deck heights w\/ beefy .750” deck thickness, Both standard deck (5.67”\/5.87”- same as LS7) \u0026amp; tall deck (5.94”\/6.38”) cylinder liner lengths available, “Long arm friendly” – Accommodations for up to 4.6” stroke w\/ standard rod pin diameters (2.100”) \u0026amp; oversized 60mm camshaft, Main cap surface area maximized at mating surface \u0026amp; large fillets from cap to cross bolts for added strength, Designed for clearance – side oil galley moved outboard \u0026amp; engineered rod clearance come standard, Significantly increased windage passage area under bores \u0026amp; around caps over LS7\/LSX engines, 6 head bolt design w\/ full water jacket around the cylinders (based on LS7 design), Bay-to-bay breathing improved w\/ increased side window area versus LSX \u0026amp; LS7, Extra-large windows in valley for access to inboard “6th” head bolt, Extra-long liners for standard (5.87”) \u0026amp; tall (6.38”) decks.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eRaised cam centerline (.388”\/9.86mm) to allow larger stroke\u003c\/li\u003e\n\u003cli\u003e2 extra links in the timing chain – Timing sets available from COMP®\u003c\/li\u003e\n\u003cli\u003e.904” lifters standard\u003c\/li\u003e\n\u003cli\u003e6 head bolt design w\/ full water jacket around the cylinders (based on LS7 design)\u003c\/li\u003e\n\u003cli\u003eRHS LS Block, Standard 9.240\" Deck, .904 Lifter, 55 Roller Cam Bearing (Machined Only)\u003c\/li\u003e\n\u003cli\u003eRolled threads on all threaded holes for added strength\u003c\/li\u003e\n\u003cli\u003eGen III\/Gen IV compliant with race mounts for Gen I, Gen II, Gen III \u0026amp; Gen IV engines\u003c\/li\u003e\n\u003cli\u003eP1 MFG main stud kit standard with enough material in castings to accommodate up to a 0.5” fastener\u003c\/li\u003e\n\u003cli\u003eChilled main bearing bulkheads for added strength\u003c\/li\u003e\n\u003cli\u003eOptimized billet main caps \u0026amp; improved windage\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eManufacturer\u003c\/strong\u003e: \u003cspan\u003eRHS\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCylinder Quantity\u003c\/strong\u003e: \u003cspan\u003e8\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMain Bearing Cap Bolt Quantity\u003c\/strong\u003e: \u003cspan\u003e6\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: \u003cspan\u003eAluminum\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eDeck Height\u003c\/strong\u003e: \u003cspan\u003e9.240\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eGrade Type\u003c\/strong\u003e: \u003cspan\u003ePerformance\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCylinder Bore Diameter\u003c\/strong\u003e: \u003cspan\u003e4.125\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eCam Housing Bore Diameter\u003c\/strong\u003e: \u003cspan\u003e55mm roller bearing or 60 mm babbit\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eLifter Bore Diameter\u003c\/strong\u003e: \u003cspan\u003e0.904\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eRequired Products\u003c\/strong\u003e: \u003cspan\u003e549401-SET or 549402-SET or 549403-SET or 549404-SET and 5496 or 5497\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eRelated Products\u003c\/strong\u003e: \u003cspan\u003e70361251-8 70362501-8 70363001-8 70364001-8 70340001LUN 70840001LUN\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":51261458678038,"sku":"EDEL-54903U-904","price":6904.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0930\/0878\/9782\/files\/0_rhs_54903u-904_block_-standard-deck-0.904_v1_normalized.jpg?v=1777510874","url":"https:\/\/www.cspracing.com\/products\/edelbrock-54903u-904-%c2%ae-rhs%c2%ae-high-performance-standard-deck-ls-engine-block","provider":"Complete Street Performance","version":"1.0","type":"link"}